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NATIONAL HEALTH LABORATORY SERVICES

PROJECT SPECIFICATION

FOR THE INSTALLATION OF A HEATING, VENTILATION AND AIR CONDITIONING SYSTEM AND ELECTRICAL UPGRADE AT THE CHARLOTTE MAXEKE ACADEMIC HOSPITAL, JOHANNESBURG

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PART 5 PROJECT SPECIFICATION

1.0GENERAL

This contract describes the design, manufacturing, delivery, installation, commissioning, testing and handing over in a fully working state the air conditioning and ventilation systems, and electrical upgrades for the NHLS Laboratories at the Charlotte Maxeke Academic Hospital, 5 Jubilee Road, Parktown, Johannesburg.

Over and above the equipment specified in this section, the contractor must make allowance for all other or additional equipment required for the full working installation. This shall include all safety equipment required by the OHS Act and Regulations pertaining to the works decribed in this document.

By submission of a tender the tenderer will be deemed to have acquainted himself fully with the tender document, local requirements and laws and all aspects of the work envisaged in the documents prior to the submission of his tender. Uncertainties and doubts as to the meaning and interpretation of items in these documents must be submitted to the consulting engineer to have them explained, rectified or cleared before tenders are submitted.

The Tenderer must provide all plant, scaffolding, cranage, ladders, etc and must make due allowance in his tender therefore. Tenderers shall acquaint themselves with local site conditions such as access to the site, size and type of access, supply of labour, workshop space, transport, loading and unloading facilities, scaffolding, tackle and tools needed for the erection of the installation. Additional claims by the contractor, which may arise from ignorance of the site conditions, will not be considered and tenderers are requested to visit and inspect the site.

No claim will be entertained for the working of overtime, disruption, out of sequence activities, additional supervision and/or plant which might be necessary to achieve the program dates.

The Tenderers attention is drawn to the fact that the tender for this contract work is to be NET and must not contain (directly or indirectly) any allowance, discount, payment or refund in favour of any person, company or concern whatsoever, nor will any such allowance, discount, payment or refund be made, or credited.

Any application for payment for materials stored off-site will only be considered upon receipt of an approved guarantee from an approved bank or financial institution for the full value thereof.

The Tenderer shall ensure that all items tendered for are priced exclusive of Value Added Tax (VAT). VAT shall be added to the exclusive amount to arrive at the total tender amount (inclusive of VAT) and the tenderer is required to complete the form of tender as set out.

2.0THE SITE

The site is the Charlotte Maxeke Academic Hospital, 5 Jubilee Road, Parktown, Johannesburg.

3.0PROGRAMME

The starting and completion shall be agreed with the Client upon receipt of the order.

Contractor shall note that the installation of the systems will shall be carried out in an occupied building. No claim will be entertained for the working of overtime, disruption, out of sequence activities, additional supervision and/or plant which might be necessary to achieve the programme dates.

4.0SCOPE OF CONTRACT

The air-conditioning and ventilation contract shall include but not be limited to:

a)Supply and installation of complete variable refrigerant volume heat recovery systems as per the concept design drawings and this specification. The systems shall include all indoor and outdoor units, control and electrical wiring, refrigerant piping, intelligent wall mounted controllers, central controller with open protocol BMS, junction boxes, condensate piping, supports, brackets, sundries, refrigerant gas, etc, as per the drawings and schedules and this specification.

b)Adjusting the existing supply airto the minimum requirements of SANS 10400 Section O.

c)Supply and Installation of new distribution boards, electrical supply cables and modifications to the existing main DB.

d)A provisional amount have been allowed for the upply and Installation of wooden fence around the outdoor unit.

e)Rigging, and the erection of scaffolding and safety hoarding as per the Health and Safety Specification and applicable regulations.

f)The builders work required for this project forms part of this contract. A provisional amount has been allowed for builders work. Variations for builders works shall be evaluated on a proven cost basis.

g)Commissioning of all systems.

h)Provision for three copies of operating and maintenance manuals including installation drawings. Installation drawings shall also be available in AutoCad format. The contents of the manual shall be as specified in the Standard Specifications, available from the Consulting Engineer on request. Five percent of the tender amount shall not be certified until the approved O&M manuals have been received. The manuals shall also be provided in PDF format on a CD with the hard-copy manuals.

i)18 months guarantee and maintenance of the installed systems.

j)Training of users and staff.

Note : Tenderers shall note that the scope of work may change due to budget constraints and that the tendered rates will apply to any changes in the scope of work.

5.0OTHER CONTRACTORS AND SPECIALISTS

All electrical, plumbing and builders work will form part of the air conditioning contract. It will be required of the airconditioning systems contractor to appoint a qualified and registered electrical subcontractor, builder and plumber as domestic subcontractors under the airconditioning systems contract to carry out the work under the supervision of the airconditioning systems contractor. Employment of these subcontractors and other specialists shall in no way exonerate the airconditioning systems subcontractor from his obligations in terms of this contract.

6.0WORK BY OTHERS

Not applicable

7.0BUILDERS WORK ITEMS

Builders work to be carried out as part of this contract shall broadly entail the following:

  • Making and making good afterwards of openings in walls, floors, roofs, etc.
  • careful removal of ceilings and re-instatement where practical or replacement where not practical
  • all work relating to installation of hangers, routing of piping, resealing of fire penetrations, core-drills, etc
  • removing of existing plinths and casting or forming of any plinths (minimum 24 MPa) or platforms on which equipment is to be mounted

8.0Plumbing Items

All airconditioning system condensate drainage work from the indoor units to the nearest drain connection point shall be carried out by the airconditioning systems contractor. uPVC plastic drain piping may be used, however sufficient support in the form of holderbats and supporting trays shall be provided to ensure even falls on the piping.

9.0ELECTRICAL SUPPLY

9.1The available electrical supply shall on site is 400 Volts, 50Hz, 3 phase or alternatively 230 Volts, 50 Hz, single phase. This supply is not guaranteed.

9.2Normal operating voltage shall be at 400 Volt, 3-phase, four wires or 230 Volt, single phase, three wires.

10.0COMPLIANCE WITH REGULATIONS

The installation shall be erected and carried out in compliance with:

a.The Occupational Health and Safety Act 85 of 1993 and as amended incorporating SANS 0142.

b.The SANS Code of Practice for the Wiring of Premises No. 0142 of 1981, as amended.

c.The local Municipal by-laws and regulations as well as the regulations of the local Supply Authority.

d.The local Fire Regulations.

e.The Standard Regulations of any Government Department or public service company where applicable.

f.SANS 0400 : Building regulations

g. Other relevant SANS regulations pertaining to HVAC and Electrical installations

The Contractor shall at his cost issue all drawings and notices in respect of modification of the installation to the local authorities, and shall indemnify and exempt the Employer from all losses, costs or expenditure which may arise as a result of the contractor's negligence to comply with the requirements of the regulations stipulated above. No work shall be commenced by the contractor prior to the approvals by the local authority of the relevant drawings or applications to perform work.

It shall be assumed that the contractor is conversant with the abovementioned requirements. Should any requirement, bylaw or regulation, which contradicts the requirements of this document, apply or become applicable during erection of the installation, such requirement, bylaw or regulation shall overrule this document and the contractor shall immediately inform the Employer of such a contradiction. Under no circumstances shall the contractor carry out variations to the installation in terms of such contradictions without obtaining written permission to do so from the Employer.

Also refer to the Standard Specification.

11.0SERVICE CONDITIONS

All equipment and capacities specified herein shall be rated at the following conditions:

Altitude:1500 m

Temperature:Summer / CoolingWinter / Heating

Ambient Air30 °C (DB), 22°C (WB)1°C (DB), 0°C (WB)

Ventilation rates:Per building regulations.

Max noise Levels (as per SANS 10103)

Design equivalent
continuous rating level
(LReq,T)a for ambient noise
dBA
Meeting/Seminar rooms / 35
Offices/Office Areas / 42
Bathrooms and toilets / 45

Note: The correct system configuration and final sizes of ducts and attenuators must be calculated by the A/C contractor to ensure that the sound levels do not exceed the above criteria.

12.0WORKMANSHIP AND QUALITY OF MATERIALS

The contractor shall employ only competent artisans to perform construction and installation work on site.

The contract shall be executed with the best workmanship in a workmanlike manner to the satisfaction of the Employer. Should any workmanship not be to the satisfaction of the Employer, it shall be rectified at the cost of the contractor.

The contractor shall remain responsible for the correct and complete delivery of the installation. Inspection by the Employer shall not release the contractor from his responsibility.

Only material of high quality and suitable for the climatic conditions of the site shall be used and shall be subject to approval of the Employer. All material shall conform in respect of quality, manufacture, tests and performance, with the requirements of the SABS or where no such standards exist, conform to the appropriate current Specifications of the British Standards Institution. Materials manufactured in South Africa shall as far as possible be used and where applicable shall bear the SANS mark. Imported materials shall comply with the requirements of the appropriate B.S. or I.E.U. specification. All materials shall be suitable for the conditions under which the materials are installed and used.

Should the materials or components not be suitable for temporary use under site conditions, then the contractor shall provide suitable protection at his own cost until these unfavourable site conditions cease to exist.

13.0DESCRIPTION OF THE AIR-CONDITIONING SYSTEMS

13.1General description

The existing heating, ventilation and airconditioning systems for the office areas in the laboratory complex comprise of a full outdoor air system that forms part of the central hospital system. This system suffers from intermittent break downs which leads to uncomfortable conditions inside the offices.

A new variable refrigerant flow system, comprising of cassette units, BC- controllers and outdoor units, shall be installed in the ceilings to each office, and the ventilation rates to each office adjusted to satisfy the minimum requirements to each office.

Refer to the concept design drawings.

13.2Variable Refrigerant Flow

13.2.1General

A dedicated Mitsubishi City Multi system with heat recovery shall be installed. The systems shall consist of variouscassette typeevaporator units reticulated back to the central air cooled condenser plant.

Refer to the concept design drawings and schematic provided.

13.2.2Air cooled condenser plant

One new condenser plant shall be installed. The condenser plants in the light well as indicated on the concept design drawings.

The refrigerant piping leading from the condenser plant to the BC box shall not exceed 50 m.

The condensers shall be freely ventilated and installed as dictated by the Mitsubishi installation manual. All equipment shall be suitable for use in a corrosive environment as is typically found in the urban regions. The units shall be protected against hail and temperatures below freezing.

Refer to the drawings and the schedules.

13.2.3Indoor units (evaporator units)

All equipment indoor units shall becassette type units, with factory fitted condensate pumps. The units shall be controlled via a hard wired wall mounted controller. New surface mounted white 8mm EGA trunking, or similar approved, shall be installed from the controller to the evaporater unit for the control wiring. The controller shall be located in close proximaty to the light switch.

Refer to the drawings and the schedules.

14.0CONTROL SYSTEMs

14.1.1City Multi V

The City Multi V system shall utilize the standard provided wall mounted controls.

The central HVAC controller shall allow for central control of all functions of the control systems.

The central controller shall provide trending and logging functions of parameters such as room and supply air temperature, room energy consumption, overall energy consumption, kWh trends, etc.

15.0ELECTRICAL INSTALLATION

15.1General

The electrical installation will comprise of two portions, namely the electrical installation pertaining to the HVAC system, and upgrades to the general electrical supply various areas.

The electrical installation pertaining to the HVAC system is described below. The upgrades to the general electrical supply and the installation of the new electrical supply cable to the HVAC plant is described in the electrical project specification.

The electrical installation pertaining to the HVAC installation comprise of the following:

  1. A new IP 65 electrical distribution board shall be supplied and installed in the outdoor plant area
  2. This ACDB shall be supply power to the following units
  3. Condensor plant
  4. All evaporator units
  5. BC controllers
  6. Central controller

15.2Conduiting and Chasing of Walls

The contractor shall be responsible for all bosal conduiting or trunking, cable trays etc. required by him for his electrics in plant areas, etc.

Cables in internal plant areas, storerooms etc. may run exposed, surface mounted or on cable trays (depending on the application, support required etc.)

15.3Wiring Diagrams

Wiring diagrams are to be submitted to the Engineer for scrutiny before commencement of the manufacture of the switchboards or the installation of the field wiring on site. On completion of the installation, the drawings are to be modified to reflect the as-built status. These diagrams will form part of the Operating and Maintenance Manual for the project.

At completion of the contract a Certificate of Compliance for the electrical work carried out shall be provided to the Consulting Engineer and a certified copy shall be included in the O&M manual.

15.4Switchboard Diagrams

The as-built circuit diagrams of the AC switchboards shall be framed and mounted in the associated AC Plant area for each apartment (as indicated on the concept design drawings), at least 1 week prior to contract completion. The wiring diagrams shall be laminated and hinged into the distribution board.

15.5Fire alarms interface

In the event of a fire all plant shall switch off. A provision amount is allowed for the provision of a signal from the fire detection system to the outdoor units. This signal can be normally closed or normally open. When the fire detection signal is activated, the plant shall be switched off via a relay.

Interfacing the fire detection system via the controls system shall not be accepted.

It shall be the responsibility AC contractor to ensure that the AC system is integrated with the fire detection system and tested.

16.0REFRIGERANT AND CONDENSATE PIPING

General good practice requirements such as the following may also apply (OEM requirements take preference):

  • Refrigeration pipe routes shall be coordinated to minimize the length of the routes. Route lengths must remain within the recommended equivalent lengths as specified by the manufacturer of the air-conditioning equipment. A record must be kept of exact pipe lengths installed in order to facilitate the calculation of additional charge.
  • Pipework shall be run plumb and parallel to the structure. The piping shall in all cases in the roof space be run within a rectangular sheet metal tray equal to the heavy duty cable tray and supports by Cape Support Systems. The tray will be supported at not more than 1m intervals. The refrigerant piping shall run in galvanised trunking on the outside of the building and shall be painted to the colour of the walls.
  • Both suction and liquid lines are to be insulated with closed-cell insulation, Armaflex AF of 19mm thickness or equal.
  • Refrigeration piping shall be oxidized phosphorous seamless copper tube. All piping shall be new and the ends plugged. Whenever pipe work is opened for jointing nitrogen gas shall be passed through the piping to prevent oxidation. No aluminium piping shall be accepted for this project.
  • Joints in pipe work are to be hard soldered capillary joints utilizing either phosphor-copper or silver solder with suitable flux. Pipe work must be annealed prior to flaring. Once all jointing work is complete, the pipe work must be flushed with nitrogen to remove oxidation, dirt and moisture and to check connections.
  • Pipe work shall be pressure tested with nitrogen in the following stages:

i300 kPa for 3 minutes

ii.1500 kPa for 3 minutes

iii.2800 kPa for 24 hours

Pipe work will only be accepted if stage (iii) is accomplished.

  • After pressure testing the pipe work shall be vacuum dried in accordance with the manufacturer's specifications.
  • After vacuum drying the system must be charged with additional refrigerant as calculated in accordance with the length and gauge of piping installed. Charging must be done to the liquid line with equipment that will meter the charged refrigerant mass exactly. The volume of basic and additional charge must be recorded on the outdoor unit name plate.
  • Drain pipe work shall be PVC with a nominal bore of not less than 32 mm or as indicated on the drawings. The piping shall be supported at 600mm intervals and be run at a continuous fall of at least 1:50 to the nearest drain point. The pipes shall be wrapped in drip tape to prevent condensation to form on the outside of the pipe. uPVC plastic piping may be used in lieu of copper, however sufficient support in the form of holderbats and supporting trays shall be provided to ensure even falls on the piping.
  • A mimum 60 mm nominal bore PVC condensate collector pipe shall be installed in the ceiling in the passage way. Each air conditioning unit shall be fitted with a condensate pump. The condensate shall be pumped upwards and the fed by gravity to the collector pipe. The collector pipe shall be reticulated to the nearest foul drain.

17.0FILTERS